RHSA-2019:4154 - Security Advisory

Topic

An update for kernel-alt is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

• Kernel: KVM: OOB memory access via mmio ring buffer (CVE-2019-14821)
• kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service (CVE-2017-18203)
• kernel: use-after-free Read in vhost_transport_send_pkt (CVE-2018-14625)
• kernel: Information leak in cdrom_ioctl_drive_status (CVE-2018-16658)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

• IPMI use after free issue seen on Marvell ThunderX2 (BZ#1732163)
• kernel: siginfo delivers SEGV_MAPERR instead of SEGV_ACCERR [rhel-alt-7.6.z] (BZ#1757189)

Enhancement(s):

• [Marvell 7.7 z-stream BUG] CN99xx: DIMM label not extracted in EDAC hw error log (BZ#1721427)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Affected Products

• Red Hat Enterprise Linux for ARM 64 7 aarch64
• Red Hat Enterprise Linux for Power 9 7 ppc64le
• Red Hat Enterprise Linux for IBM System z (Structure A) 7 s390x

Fixes

• BZ - 1550811 - CVE-2017-18203 kernel: Race condition in drivers/md/dm.c:dm_get_from_kobject() allows local users to cause a denial of service
• BZ - 1619846 - CVE-2018-14625 kernel: use-after-free Read in vhost_transport_send_pkt
• BZ - 1627731 - CVE-2018-16658 kernel: Information leak in cdrom_ioctl_drive_status
• BZ - 1746708 - CVE-2019-14821 Kernel: KVM: OOB memory access via mmio ring buffer

CVEs

• CVE-2017-18203
• CVE-2018-14625
• CVE-2018-16658
• CVE-2019-14821

References

• https://access.redhat.com/security/updates/classification/#important